# std::logical_not<void>

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< cpp‎ | utility‎ | functional

Defined in header `<functional>` |  |
template<> class logical_not<void>; |  | (since C++14)

std::logical_not<void> is a specialization of std::logical_not with parameter and return type deduced.

### Nested types

Nested type | Definition
`is_transparent` | unspecified

### Member functions

operator() | applies `operator!` to its argument (public member function)

## std::logical_not<void>::operator()

template< class T > constexpr auto operator()( T&& arg ) const -> decltype(!std::forward<T>(arg)); |  |

Returns the result of !std::forward<T>(arg).

### Parameters

arg | - | value to apply logical NOT to

### Return value

!std::forward<T>(arg).

### Example

| This section is incomplete Reason: no example

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